Green sulfur dye.



AUGUST LEOPOLDILASKA, or OFFEXBACH-ON-THE-MAIN, GERMANY,

ASSIGNOR TO CHEMISCHE FABRIK GRIESHEIM ELEKTRON, OF

FRANKFORT-ONTHE-MAIN, GERMANY, A CORPORATION.

GREEN SULFUR DYE.

Specification of Letters Patent.

Application filed November 6. 1905. Serial No. 342,175.

Patented Feb. 5, 1907.

' To aZZ whom it may concern:-

Be it known that 1, AUGUST LEoPoLn advantage to melt the leuco paste with alka- LAsKA, doctor of philosophy, chemist, and a line polysulfids at once, as it will be oxidized resident of 5 Gerberstrasse, Offenbach-on-the in getting dry. An alkaline solution of the Main, in theGrand Duchy of Hesse, Germany, have invented new and useful Improvements in Green Sulfur Dyestuffs, of which the following is a specification.

I have found that new green sulfur dye stuffs result by melting in the presence of copper. alkaline polysulfids with indophenols, obtained by joint oxidation ofparaamidophenol and alpha-naphthylarylsulfamids, (as described by O. N. YVitt and G. Schmitt,Bc1ichte der Deutschen Ohemischen Gesellschaft, XXVII, 2370.) In place of the indophenols their leuco derivatives obtained by reduction can be used in producing the dyestuffs. The dyestuffs thus obtained are easy soluble in water and notwithstanding extremely fast to washing.

The following examples will illustrate my invention. The parts are by weight.

EmcmpZe-Pr0cess of making the indo 'henols and their leuco derivati ves.-One hundred and nine parts of para-amidophenol are dissolved in one thousand parts of water and powder hardly soluble in water, solulfie in one hundred and forty parts ofcaustic-soda lye, 35 Baum two hundred and ninetyseven parts of alpha naplithyl-para-tolylsulfamid are dissolved in one thousand parts of water and two hundred and ten parts ofcaustic-soda'r'lye, 35 Baum. Both solutions are mixed, cooled by means of ice, and then an ice-cold solution of hypochlorite of sodium, containing thirty-two parts of active oxygen, is poured in. The temperature is kept below zero during the oxidizing process. phenol separates out as a resinous matter and heating up to 75 centigrade'an almost clear i solution is obtained, which may be filtered. i

The phenylnaphthylamin derivative is precipitated in form of a yellow-brown deposit by the addition of a mineral acid. The de- The indo can beldirectly melted with alkaline polyl leuco compound will be oxidized very quickly, producing a bluish-violet color. In an alkaline alcoholic solution of the leuco derivative a pure blue is produced by the influence of the air.

Process of making the suZfur-dyestafis.- Forty-six parts of the indophenol obtained from para-amidophenol and alpha-naphthyl paratolylsulfamidor the corresponding quantity of the leuco paste are melted together with one hundred and. sixty-eight parts of crystallized sodium sulfid and sixty-seven parts of sulfur, a. solution of eight parts of sulfate of copper or two parts of metallic copper powder having been added. The

-mixture is evaporated till the temperature of it shows 120 centigrade. The temperature is kept at this point for twenty hours. The resulting green melt is diluted with one thousand parts of water heated and filtered ofi from impurities. The dyestuff is precipitated by introducing a current of air in the solution. The dry dyestufi is a blackreen concentrated sulfuric acid with blue color, in alkali sulfids with reen color. ton green tints o remarkable fastness to washing. The process of making dyestuffs from other alpha-na hthylsulfamidsfor instance, alpha-napht ylbenzene sulfan1ids. may be performed in the same manner.

Now what I claim, and desire to secure by 2. As a new article of manufacture the green sulfur dyestufi's resulting by heating the indophenols, obtained by the joint oxidation of para-amidophenol and alpha-naphthylarylsulfamids with alkali polysulfids in the presence of copper, which dyestuffs form It dyes cot-' L posit is filtered off and pressed. V It is of great black-green powders, hardly soluble inwater, J presehce of two witnesses, this 23d day 'of solublein concentratedsulfuric acidwithbluc October, 1906.

color, in sodium sulfid with green v0010f, dyeing cotton reen shades of remarkable fast- AUGUST LEOPOLD LASKA' ncss to was ing, substantially as described. Witnesses:

In testimony that I claim the foregoing as i EVA SATTLER,

my invention Ihave signed'my name, in ASKRER STANDBRANDTL 

